Yeah,
That certainly is true, and would be a work around for this specific part: as it had a Fillet curving up towards the top of the main body.
Unfortunately, AFAIK, printing from Outer → Inner walls can reduce the efficacy of producing nice, shallow overhangs.
I would presume that: if tested, 45 degree overhangs would see minimal impact, but trying to print something closer to 70 degree overhangs: using outer → inner, would produce a less than favorable surface. (maybe excluding some, specific filaments)
But, given the context of this print, I would agree: using the outer-to-inner wall sequence would resolve the surface defects; but might lead to a propagating issue: inward, that would affect the top layers. I just know that the original person that posted, here: ( Higher wall count = z-banding - #19 by SavvyPrints ) was also struggling to print similarly ‘6-walled’ parts: noting that others didn’t seem to run into this kind of issue.